Sin(a+2п)-cos(-3 п/2 +a)/2sin(a-2п) = 1 1/2
sin(a)-2*(sin*a))/sin(a)
3sin(a)/2sin(a)
3/2
1 1/2
(5+5)*(5+5)-(5-5)=10*10-0=100-0=100
(11-1)*(11-1)=10*10=100
(222-22):2=200:2=100
111:1-11=111-11=111-11=100
1 027×378-72÷36×905-628÷4
1)1027 ×378=388 206
2)72÷36=2
3) 2×905=1810
4)628÷4=157
5)388 206- 1810=386396
6) 386396-157=386 239